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摘要
Owing to the robust of the multilevel fast multipole method (MLFMM), large dense linear systems, arising from discretised electric field integral equations of electromagnetic scattering problems, are generally solved by a Krylov iterative solver. An efficient preconditioning technique based on hierarchical LU-decomposition (H-LU) is proposed to accelerate the convergence rate of the Krylov iterations. The H-LU preconditioner is constructed from the available sparse near-field matrix and provides a data-sparse way to approximate its LU-factors, which can be computed and stored in H-matrix arithmetic with almost linear complexity. The accuracy of the approximation is adjustable that will guarantee a bounded number of iterations. Some means are introduced to further lower the computational cost of the H-LU. Numerical examples are provided to illustrate that the resulting H-LU preconditioner is effective and flexible with MLFMM to reduce both the iteration number and the overall simulation time significantly.
- 出版日期2011-8-19
- 单位南京理工大学
